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首页> 外文期刊>Journal of Oleo Science >Electronic Modification Effects Induced by Fe in Pt-Ru-Fe Ternary Catalyst on the Electrooxidation of CO/H_2 and Methanol
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Electronic Modification Effects Induced by Fe in Pt-Ru-Fe Ternary Catalyst on the Electrooxidation of CO/H_2 and Methanol

机译：Fe在Pt-Ru-Fe三元催化剂中引起的电子修饰作用对CO / H_2和甲醇的电氧化作用

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摘要

Electro-oxidation of CO/H_2 and methanol was performed over a carbon supported Pt-Ru-Fe ternary alloy catalyst prepared via the conventional NaBH_4 reduction method. Physicochemical and electrochemical measurements were used to elucidate the respective roles of Ru and Fe in the ternary catalyst, revealing synergistic effects in the Pt-Ru-Fe catalyst on the electro-oxidation of CO/H_2 and methanol. The methanol oxidation activity of Pt_3Ru_2Fe/C was ca. 2.5 times higher than that of PtRu/C at 0.45 V vs. RHE as a result of enhanced CO tolerance. The enhanced CO tolerance of the Pt-Ru-Fe ternary alloy catalysts was derived from the reaction between the high mobility, weakly adsorbed CO on the Pt site that was electronically modified by alloying with Fe and adsorbed water species on the Ru site. This combination of features produced an improvement in the electro-oxidation of CO/H_2 and methanol at lower potential. On the basis of the data, it was proposed that the addition of a water activator such as Ru is indispensible in the design of multicomponent alloy catalysts for methanol oxidation, and the additional effect derived from an electronic modifier is an important factor for improving the CO and methanol oxidation activity of the catalyst containing the water activator.
机译：在通过常规NaBH_4还原方法制备的碳载Pt-Ru-Fe三元合金催化剂上进行CO / H_2和甲醇的电氧化。物理化学和电化学测量被用于阐明三元催化剂中Ru和Fe的各自作用，揭示了Pt-Ru-Fe催化剂对CO / H_2和甲醇电氧化的协同作用。 Pt_3Ru_2Fe / C的甲醇氧化活性约为。相对于RHE，在0.45 V电压下，PtRu / C的2.5倍高，因为CO耐受性增强。 Pt-Ru-Fe三元合金催化剂对CO的耐受性增强是由于Pt位上的高迁移率，弱吸附的CO之间的反应，该反应通过与Fe合金化和Ru位上的吸附水物种进行电子改性。这些特征的组合在较低电势下改善了CO / H_2和甲醇的电氧化。根据这些数据，建议在设计用于甲醇氧化的多组分合金催化剂时，必不可少的是加入水活化剂（如Ru），而电子改性剂带来的附加效果是改善CO的重要因素。含有水活化剂的催化剂的甲醇氧化活性。

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  • 来源
    《Journal of Oleo Science》 |2012年第3期|p.127-134|共8页
  • 作者

    Taeyoon Kim; Koichi Kobayashi; Tetsuo Take; Masayuki Nagai;

  • 作者单位

    Department of Chemistry and Energy Engineering, Tokyo City University (Tokyo 158-8557, JAPAN);

    Department of Chemistry and Energy Engineering, Tokyo City University (Tokyo 158-8557, JAPAN),Research Center for Energy and Environmental Science, Advance Research Laboratory, Tokyo City University (Tokyo 158-0082, JAPAN);

    Department of Chemistry and Energy Engineering, Tokyo City University (Tokyo 158-8557, JAPAN),Research Center for Energy and Environmental Science, Advance Research Laboratory, Tokyo City University (Tokyo 158-0082, JAPAN);

    Department of Chemistry and Energy Engineering, Tokyo City University (Tokyo 158-8557, JAPAN),Research Center for Energy and Environmental Science, Advance Research Laboratory, Tokyo City University (Tokyo 158-0082, JAPAN);

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  • 正文语种 eng
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  • 关键词

    Pt-Ru-Fe ternary catalyst; CO tolerance; methanol oxidation; ligand effect; fuel cell;

    机译：Pt-Ru-Fe三元催化剂;CO耐受性甲醇氧化;配体效应燃料电池;

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